Effect of different torques in cyclic fatigue resistance of K3 rotary instruments

Authors

  • Dirce Akemi Sacaguti Kawakami Universidade Santa Cecília – UniSanta
  • George Táccio de Miranda Candeiro Universidade de São Paulo - USP
  • Eduardo Akisue Universidade Santa Cecília – UniSanta
  • Celso Luiz Caldeira Universidade de São Paulo - USP
  • Giulio Gavini Universidade de São Paulo - USP

DOI:

https://doi.org/10.20396/bjos.v14i2.8640825

Keywords:

Dental instruments, Endodontics, Fatigue, Root canal preparation, Torque

Abstract

Aim: To assess the effect of different torque values on cyclic fatigue resistance of K3 rotary nickeltitanium (NiTi) files. Methods: Eighty K3 files, size 25 mm, taper 0.04 were divided in 4 groups according to different torques (0.5, 1, 2 and 6 Ncm) and were submitted to a cyclic fatigue test. This test was performed with a device that allowed the file to rotate inside a stainless steel artificial curved canal, simulating the pecking motion. Files rotated until fracture occurred and time to failure was recorded in seconds with a stopwatch. Data were analyzed by ANOVA and Tukey tests (p<0.05). Results: All groups were compared and only the group of 6 N.cm showed statistically significant difference (p=0.0002). Conclusions: For #25.04 K3 files, the evaluated torques up to 2 N.cm had no influence on cyclic fatigue resistance. Using 6 N.cm torque value resulted in lower resistance to cyclic fatigue.

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Author Biographies

Dirce Akemi Sacaguti Kawakami, Universidade Santa Cecília – UniSanta

Universidade Santa Cecília – UniSanta, Faculdade de Odontologia, Departamento de Endodontia

George Táccio de Miranda Candeiro, Universidade de São Paulo - USP

Universidade de São Paulo - USP, Faculdade de Odontologia, Departamento de Odontologia Restauradora

Eduardo Akisue, Universidade Santa Cecília – UniSanta

Universidade Santa Cecília – UniSanta, Faculdade de Odontologia, Departamento de Endodontia

Celso Luiz Caldeira, Universidade de São Paulo - USP

Universidade de São Paulo - USP, Faculdade de Odontologia, Departamento de Odontologia Restauradora

Giulio Gavini, Universidade de São Paulo - USP

, Faculdade de Odontologia, Departamento de Odontologia Restauradora

Published

2015-07-01

How to Cite

1.
Kawakami DAS, Candeiro GT de M, Akisue E, Caldeira CL, Gavini G. Effect of different torques in cyclic fatigue resistance of K3 rotary instruments. Braz. J. Oral Sci. [Internet]. 2015 Jul. 1 [cited 2022 Dec. 10];14(2):122-5. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8640825

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